#include <etcd/Client.hpp>
#include <etcd/KeepAlive.hpp>
#include <etcd/Response.hpp>
#include <etcd/Watcher.hpp>
#include <etcd/Value.hpp>
#include <thread>

void callback(const etcd::Response &resp)
{
    if (resp.is_ok() == false)
    {
        std::cerr << "收到一个错误事件通知: " << resp.error_message() << std::endl;
        return;
    }
    for (auto const&ev : resp.events())
    { 
        if (ev.event_type() == etcd::Event::EventType::PUT)
        {
            std::cout << "数据发生改变" << std::endl;
            std::cout <<"cur-key: "<<ev.kv().key()<<"-"<<ev.kv().as_string()<<std::endl;
            std::cout <<"prev-key: "<<ev.prev_kv().key()<<"-"<<ev.prev_kv().as_string()<<std::endl;
        }
        else if(ev.event_type() == etcd::Event::EventType::DELETE_)
        {
            std::cout<<"服务信息下线, 被删除:"<<std::endl;
            std::cout <<"cur-key: "<<ev.kv().key()<<"-"<<ev.kv().as_string()<<std::endl;
            std::cout <<"prev-key: "<<ev.prev_kv().key()<<"-"<<ev.prev_kv().as_string()<<std::endl;
        }
    }
}

int main(int argc, char *argv[])
{
    std::string etcd_host = "http://127.0.0.1:2379";
    // 实例化客户端对象
    etcd::Client client(etcd_host);

    // 获取指定键值对信息
    auto resp = client.ls("/sercice").get();
    if (resp.is_ok() == false)
    {
        std::cerr << "获取键值对失败" << resp.error_message() << std::endl;
        return -1;
    }
    int sz = resp.keys().size();
    for (int i = 0; i < sz; ++i)
    {
        std::cout << resp.value(i).as_string() << "可以提供: " << resp.key(i) << std::endl;
    }

    // 实例化一个键值对事件监控对象
    auto watcher = etcd::Watcher(client, "/service", callback, true);
    watcher.Wait();

    return 0;
}